LoginBean doesn't compile

[Ricky James]

Hello,

I am trying to deploy an application from Struts for Dummies. The app has some classes including LoginBean class and a UserDTO class. I am facing problems with these 2. UserDTO compiles ok but when I try to compile LoginBean I get this error:


C:\Documents and Settings\HP_Administrator>cd C:\Program Files\Apache Group\Tomc
at 5.5\webapps\Login5b\source\dummies\struts

C:\Program Files\Apache Group\Tomcat 5.5\webapps\Login5b\source\dummies\struts>j
avac LoginBean.java
LoginBean.java:91: cannot find symbol
symbol : class UserDTO
location: class dummies.struts.LoginBean
UserDTO user = new UserDTO(username, password, age, status);
^
LoginBean.java:91: cannot find symbol
symbol : class UserDTO
location: class dummies.struts.LoginBean
UserDTO user = new UserDTO(username, password, age, status);
^
2 errors

Can someone figure what the problem is. Shall really appreciate.

Thanks in advance.
Ricky James

The code of the 2 files is pasted below:

package dummies.struts;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
 
public class LoginBean 
{   

    /**
     * determine if the username/password combination are
     * present in the validUsers repository.
     * @param username
     * @param password
     * @return boolean true if valid, false otherwise
     */
    public boolean validateUser(String username, String password)
    {
        System.out.println("Using " + getClass().getName());
boolean valid = false;       
       
        Connection con = null;
        Statement stmt = null;
        ResultSet rs = null;
        try 
        {
Class.forName("com.mysql.jdbc.Driver");
            
con = DriverManager.getConnection("jdbc:mysql://localhost/logins", "root", "password");
                                
            stmt = con.createStatement(); 
              
            rs = stmt.executeQuery(
                "SELECT * FROM users " +
                "WHERE username = '" + username + "' " +
                "AND password = '" + password + "'");
            
            if (rs.next())
                valid = true;
        } 
catch (ClassNotFoundException e) {
e.printStackTrace();
}
        catch(SQLException e) {
            e.printStackTrace();
        }
        finally {
            try { if (rs != null) rs.close(); } catch (SQLException e) {};
            try { if (stmt != null) stmt.close(); } catch (SQLException e) {};
            try { if (con != null) con.close(); } catch (SQLException e) {};
        }
        return valid;
    }
    
    /**
     * Retrieve a list of all users.
     * @return ArrayList containing a list of Transfer Objects (TO) of type
     *         UserTO. Returns an empty ArrayList if none where found.
     */
    public ArrayList getAllUsers()
    {
        ArrayList users = new ArrayList();  
             
        Connection con = null;
        Statement stmt = null;
        ResultSet rs = null;
        try 
        {
Class.forName("com.mysql.jdbc.Driver");
            
con = DriverManager.getConnection("jdbc:mysql://localhost/musiccollection", "root", "17zero277");
                
            stmt = con.createStatement(); 
              
            rs = stmt.executeQuery(
                "SELECT username, password, age, status " +
                "FROM Users ");
            
            while (rs.next())
            {
                // Retrieve one user record at a time
                String username = rs.getString(1);
                String password = rs.getString(2);
                int age = rs.getInt(3);
                String status = rs.getString(4);
                
                // Create new user transfer object
                UserDTO user = new UserDTO(username, password, age, status);
                
                // Add user to list of users
                users.add(user);
            }
        } 
catch (ClassNotFoundException e) {
e.printStackTrace();
}
        catch(SQLException e) {
            e.printStackTrace();
        }
        finally {
            try { if (rs != null) rs.close(); } catch (SQLException e) {};
            try { if (stmt != null) stmt.close(); } catch (SQLException e) {};
            try { if (con != null) con.close(); } catch (SQLException e) {};
        }
        return users;
    }
}

package dummies.struts;
 
import java.io.Serializable;
 
/**
 * User Transfer Object (TO). Previously called Value Object (VO) 
 * or sometimes Data Transfer Object (DTO).
 */
public class UserDTO implements Serializable
{
    private String username = null;
    private String password = null;
    private int age = 0;
    private String status = null;
    
    public UserDTO(String username, String password, int age, String status)
    {
        this.username = username;
        this.password = password;
        this.age = age;
        this.status = status;    
    }
    
    public String getUsername() {
        return username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public int getAge() {
        return age;
    }
 
    public String getStatus() {
        return status;
    }
}

[Merrill Higginson]

The error message is telling you that you haven't included the UserDTO class in your compile-time classpath when you're trying to compile the LoginBean class.

I'd suggest you not compile classes into the same directory as the source, but specify a different destination directory. Either way, you must include the destination directory in your classpath. example:

javac -c ../../../WEB-INF/classes;%classpath% -d ../../../WEB-INF/classes LoginBean.java

[Ricky James]

Originally posted by Merrill Higginson:
The error message is telling you that you haven't included the UserDTO class in your compile-time classpath when you're trying to compile the LoginBean class.

I'd suggest you not compile classes into the same directory as the source, but specify a different destination directory. Either way, you must include the destination directory in your classpath. example:

javac -c ../../../WEB-INF/classes;%classpath% -d ../../../WEB-INF/classes LoginBean.java

Hello Merrill,

Thanks for the reply and advice. I tried what you suggested but I got a lot of errors. The whole of the errors are pasted below. I think I might have to add something to the classpath. Can you please advise what I can do?

Thanks in advance.
Ricky

C:\Program Files\Apache Group\Tomcat 5.5\webapps\Login5b>javac -d WEB-INF/classe
s -classpath /WEB-INF/classes source/dummies/struts/*.java
source/dummies/struts/LoginAction.java:3: package javax.servlet.http does not ex
ist
import javax.servlet.http.HttpServletRequest;
^
source/dummies/struts/LoginAction.java:4: package javax.servlet.http does not ex
ist
import javax.servlet.http.HttpServletResponse;
^
source/dummies/struts/LoginAction.java:6: package org.apache.struts.action does
not exist
import org.apache.struts.action.Action;
^
source/dummies/struts/LoginAction.java:7: package org.apache.struts.action does
not exist
import org.apache.struts.action.ActionError;
^
source/dummies/struts/LoginAction.java:8: package org.apache.struts.action does
not exist
import org.apache.struts.action.ActionErrors;
^
source/dummies/struts/LoginAction.java:9: package org.apache.struts.action does
not exist
import org.apache.struts.action.ActionForm;
^
source/dummies/struts/LoginAction.java:10: package org.apache.struts.action does
not exist
import org.apache.struts.action.ActionForward;
^
source/dummies/struts/LoginAction.java:11: package org.apache.struts.action does
not exist
import org.apache.struts.action.ActionMapping;
^
source/dummies/struts/LoginAction.java:13: cannot find symbol
symbol: class Action
public class LoginAction extends Action
^
source/dummies/struts/LoginAction.java:15: cannot find symbol
symbol : class ActionMapping
location: class dummies.struts.LoginAction
public ActionForward execute( ActionMapping mapping,
^
source/dummies/struts/LoginAction.java:16: cannot find symbol
symbol : class ActionForm
location: class dummies.struts.LoginAction
ActionForm form,
^
source/dummies/struts/LoginAction.java:17: cannot find symbol
symbol : class HttpServletRequest
location: class dummies.struts.LoginAction
HttpServletRequest req
uest,
^
source/dummies/struts/LoginAction.java:18: cannot find symbol
symbol : class HttpServletResponse
location: class dummies.struts.LoginAction
HttpServletResponse response) throws Exception

^
source/dummies/struts/LoginAction.java:15: cannot find symbol
symbol : class ActionForward
location: class dummies.struts.LoginAction
public ActionForward execute( ActionMapping mapping,
^
source/dummies/struts/LoginForm.java:3: package javax.servlet.http does not exis
t
import javax.servlet.http.HttpServletRequest;
^
source/dummies/struts/LoginForm.java:5: package org.apache.struts.action does no
t exist
import org.apache.struts.action.ActionError;
^
source/dummies/struts/LoginForm.java:6: package org.apache.struts.action does no
t exist
import org.apache.struts.action.ActionErrors;
^
source/dummies/struts/LoginForm.java:7: package org.apache.struts.action does no
t exist
import org.apache.struts.action.ActionForm;
^
source/dummies/struts/LoginForm.java:8: package org.apache.struts.action does no
t exist
import org.apache.struts.action.ActionMapping;
^
source/dummies/struts/LoginForm.java:10: cannot find symbol
symbol: class ActionForm
public class LoginForm extends ActionForm
^
source/dummies/struts/LoginForm.java:15: cannot find symbol
symbol : class ActionMapping
location: class dummies.struts.LoginForm
public void reset(ActionMapping mapping, HttpServletRequest request)
^
source/dummies/struts/LoginForm.java:15: cannot find symbol
symbol : class HttpServletRequest
location: class dummies.struts.LoginForm
public void reset(ActionMapping mapping, HttpServletRequest request)
^
source/dummies/struts/LoginForm.java:21: cannot find symbol
symbol : class ActionMapping
location: class dummies.struts.LoginForm
public ActionErrors validate(ActionMapping mapping, HttpServletRequest reque
st)
^
source/dummies/struts/LoginForm.java:21: cannot find symbol
symbol : class HttpServletRequest
location: class dummies.struts.LoginForm
public ActionErrors validate(ActionMapping mapping, HttpServletRequest reque
st)
^
source/dummies/struts/LoginForm.java:21: cannot find symbol
symbol : class ActionErrors
location: class dummies.struts.LoginForm
public ActionErrors validate(ActionMapping mapping, HttpServletRequest reque
st)
^
source/dummies/struts/LoginAction.java:32: cannot find symbol
symbol : class ActionErrors
location: class dummies.struts.LoginAction
ActionErrors errors = new ActionErrors();
^
source/dummies/struts/LoginAction.java:32: cannot find symbol
symbol : class ActionErrors
location: class dummies.struts.LoginAction
ActionErrors errors = new ActionErrors();
^
source/dummies/struts/LoginAction.java:33: cannot find symbol
symbol : class ActionError
location: class dummies.struts.LoginAction
ActionError error = new ActionError("error.login.invalid");
^
source/dummies/struts/LoginAction.java:33: cannot find symbol
symbol : class ActionError
location: class dummies.struts.LoginAction
ActionError error = new ActionError("error.login.invalid");
^
source/dummies/struts/LoginForm.java:23: cannot find symbol
symbol : class ActionErrors
location: class dummies.struts.LoginForm
ActionErrors errors = new ActionErrors();
^
source/dummies/struts/LoginForm.java:23: cannot find symbol
symbol : class ActionErrors
location: class dummies.struts.LoginForm
ActionErrors errors = new ActionErrors();
^
source/dummies/struts/LoginForm.java:26: cannot find symbol
symbol : class ActionError
location: class dummies.struts.LoginForm
errors.add("userName", new ActionError("error.username.required"));
^
source/dummies/struts/LoginForm.java:28: cannot find symbol
symbol : class ActionError
location: class dummies.struts.LoginForm
errors.add("password", new ActionError("error.password.required"));
^
Note: source/dummies/struts/LoginBean.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
33 errors

C:\Program Files\Apache Group\Tomcat 5.5\webapps\Login5b>

[Vyas]

This means you have not included all the files necessary for the project to run. It seems you have not included Struts library files. Please collect all necessary files or use Netbeans to work on the example

[Ricky James]

Originally posted by Vyas:
This means you have not included all the files necessary for the project to run. It seems you have not included Struts library files. Please collect all necessary files or use Netbeans to work on the example

Thanks for the reply Vyas. I'll try to use NetBeans.

Ricky